Definition from Wiktionary, the free dictionary
Alternative forms 
- idiomatick (obsolete)
- Pertaining or conforming to the mode of expression characteristic of a language.
- Resembling or characteristic of an idiom.
- Using many idioms.
- (music) Parts or pieces which are written both within the natural physical limitations of the instrument and human body and, less so or less often, the styles of playing used on specific instruments.
Related terms 
pertaining or conforming to the mode of expression characteristic of a language
resembling or characteristic of an idiom
parts or pieces of or styles of playing music